<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>径向渐变 - 颜色结点不均匀分布</title>
    <style type="text/css">
        div {
            width: 800px;
            height: 500px;
            background: -webkit-radial-gradient(red 50%, blue 70%);
            background: -moz-radial-gradient(red 50%, blue 70%);
            background: -o-radial-gradient(red 50%, blue 70%);
            background: radial-gradient(red 50%, blue 70%);
        }
    </style>
</head>
<body>
<div></div>
</body>
</html>